diff --git a/app/scantool/mainwindow.cpp b/app/scantool/mainwindow.cpp
index 3cf7905f..b0384ea3 100644
--- a/app/scantool/mainwindow.cpp
+++ b/app/scantool/mainwindow.cpp
@@ -25,6 +25,7 @@ MainWindow::MainWindow(QWidget *parent)
     , m_dlgScanInfo(nullptr)
     , m_devHandle(nullptr)
     , m_scanning(false)
+    , m_isFirstConnectServer(false)
     , m_dpi(200)
     , m_scanFileName("")
     , m_scanImgFmtWriter(nullptr)
@@ -1262,6 +1263,10 @@ void MainWindow::timerEvent(QTimerEvent *e)
             this->killTimer(m_timerId);
             m_timerId = -1;
         }
+        else
+        {
+            m_timerId = this->startTimer(5000);
+        }
     }
 }
 
@@ -1441,7 +1446,14 @@ void MainWindow::on_saneEventCloseDevice(void* devHandle, bool isOnline)
     }
 
     if (isOnline)
-        m_timerId = this->startTimer(5000);
+    {
+        int time = 5000;
+        if (m_isFirstConnectServer)
+            time = 15000;
+
+        m_timerId = this->startTimer(time);
+        m_isFirstConnectServer = false;
+    }
 }
 
 void MainWindow:: on_pushButtonAdd_clicked()
diff --git a/app/scantool/mainwindow.h b/app/scantool/mainwindow.h
index 1d33c4a0..773f10f5 100644
--- a/app/scantool/mainwindow.h
+++ b/app/scantool/mainwindow.h
@@ -93,6 +93,7 @@ private:
     QString m_devName;
     SANE_Handle m_devHandle;
     bool m_scanning;
+    bool m_isFirstConnectServer;
     HGUInt m_dpi;
 
     QString m_scanFileName;